Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba236d7e89b82c9…

MALICIOUS

PDF

42.1 KB Created: 2020-09-01 01:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef14c27bcbf2a5d7965234e606598a4 SHA-1: b983cb04707280475917608ad4b974869976b17f SHA-256: dba236d7e89b82c937fcb77c08ba3ce033439ce623fcc2653d05897ee52a27ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=try+again+poem+questions+and+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on platforms like Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=try+again+poem+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/vogonavamifilebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4039/8750/files/newonap.pdf
    • https://cdn.shopify.com/s/files/1/0435/8661/7501/files/baixar_adobe_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/mazedewubajalupopepekuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/mujeweranujuwafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5819/files/attitude_defined.pdf
    • https://static.usrfiles.com/ugd/b8c837_c19cd60ae07f40c994fe66c297c2a607.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_a8c92b31f943462aae473a02eef2465c.pdf
    • https://static.usrfiles.com/ugd/b8c837_538721c2a6c542a3807f4fcdeba1b002.pdf
    • https://static.usrfiles.com/ugd/4b7290_baa77bddd2204c2585517ac4b428cc57.pdf
    • https://static.usrfiles.com/ugd/b8c837_308bbcb111da4e6ebd05f5c33c41ef21.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/24990778882.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/rinudipupireduboxaraze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006382.bin
a16a05f62264ebc349132d2a0035d977e1c54265dc4aa2030d38be03731cd402
pdf-font-stream PDF embedded font (sfnt) at offset 0x6382 5516 bytes
font_01_sfnt_off0000763f.bin
112564b437ce37bfe685f66c6f247e880ca2e4b9e34e6661612779645bf10390
pdf-font-stream PDF embedded font (sfnt) at offset 0x763F 10356 bytes